| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.79 | 7.68 | 3.76 |
| 2024 | 3.29 | 4.89 | 2.48 |
| 2023 | 3.98 | 4.67 | 2.89 |
| 2022 | 3.3 | 5.17 | 2.5 |
| 2021 | 3.27 | 5.36 | 2.23 |
| 2020 | 2.72 | 3.87 | 2.07 |
| 2019 | 3.09 | 4.61 | 2.4 |
| 2018 | 4.85 | 8.85 | 2.95 |
| 2017 | 11.96 | 14.73 | 7.94 |
| 2016 | 10.62 | 14.61 | 5.56 |
| 2015 | 12.94 | 20.49 | 5.79 |
| 2014 | 12.26 | 18.38 | 8.23 |
| 2013 | 8.93 | 12.48 | 6.67 |
| 2012 | 9.64 | 13.01 | 7.32 |
| 2011 | 15.46 | 22.02 | 7.34 |